Tracing Chalice applications running on Lambda functions can be declared by:

from chalice import Chalice
import epsagon
epsagon.init(
    token='epsagon-token',
    app_name='app-name-stage',
    metadata_only=False
)
app = Chalice(app_name='hello-world')

# Your code is here

app = epsagon.chalice_wrapper(app)